Rotary extension-bell switch.



PATENTBD JULY 21, 1903.

a. E. CORK I ROTARY-EXTENSION BELL SWITCH.

APPLICATION FILED SEPT. 6. 1902.

3 SHEETS-SHEET 1.

N0 MODEL.

' Witnesses TIIJ m3 g yyez'. 0077/2:

PATENTED JULY 21, 1903.

G! E GQRK. I ROTARY EXTENSION BELL SWITCH.

APPLIOATIQN FILED SEPT. 6. 1902.

N0 MODEL.

- No 734,402. PATENTED JULY 21, 1903.

G. E. CORK.

ROTARY EXTENSION BELL SWITCH.

APPLICATION FILED SEPT. 6. 1902. NO MODEL.

s SHEETS-SHEET s SWITCH grwenfoawmmm I v -E 607/77.

STATES UNITED PATE T;

iatented July 2i,

OFFICE.

ROTARY EXTENSION-BELL SWITCH.

srnerrrcnriolv forming-part orLeaer Patent No. 734,402, flared July 2'1,190%.

Application filed September 6, 1902. Serial No. 122,379. (No rnodeLments in Rotary Extension-Bell Switches, of-

which the following is a specification.

This invention relates to a rotary extensionbell switch fortelephone-lines adapted to be applied where two telephone-linesterminate and where only one telephone and an exten:

, sion-bell are in use. r

The purpose of the, improved device is to switch the telephone to eitherline and also keep the extension-bell on the line to which the telephoneis not connected, or it may be adjusted to connect both lines as one,:if desired.

The advantages of the present invention reside in the simpleconstruction and operation of the switch, whereby any one canreadilyunderstandthe use of'the' same when a knowledge is obtained of whatchanges the different positions of a knob or analogous device indicate.The improved switch has long contact-points to provide extended surfacesto compensate for variations, does not have tobe placed precisely at acertain point, and, further, obviates any tendency toward the formationor institution of short-circuits by not having the switch properlyplaced. It is also capable of rapid operation without liability ofdamage thereto and will work in connectionwith either ground or metalliccircuits, and all the working parts are easily accessible for cleaning,repairing, and other manipulation. Moreover, when the telephone isconnected through the medium of the improved switch with either one ofthe lines and the extension-bell is onjth e opposite line there is nometallic connection then between the two lines and they work entirelyindependent of each other, thereby-providing a very desirablearrangement, especially for subscribers who wish to have lines of aprivate nature connecting their residences and places of business, andalso adapting the telephone to be connected up with the main line.

The improved switch when properly installed will render telephoneservice more satisfactory, owing to the fact that there will V be lesswork at the central station, less intors.

duction, which is a source of much confusion, and'less annoyance whereanumber of subscribers are: ona single line leading to the centralstation.

In the drawings, Figurejl is a side elevation of a switch embodying thefeatures of the invention. Fig. 2 is a top plan view of the same. Fig. 3is a top plan View with the rotary'disk'forming one of the elements ofthe switch removedQ Fig.4is a longitudinal vertical section on the line4: 4, Fig. 2. Fig. 5-is a transverse vertical section on the line 5 5,Fig. 3. Fig. 6 is a bottom plan view of the rotary disk, showing theconductors arranged thereon and the manner of connecting the peripheralcontacts with said conduc- Figs. 7 and 8 show detail perspective views,respectively, of one of the base-springs and one of the side springswith which the conductors and contacts on the disk engage several views.

The numeral 1 designates a main base of suitable shape and dimensionsand preferably constructed of non-conducting material, such as wood, andon the said base are two trans- 1 versely-extending subbases or supports2, which are spaced apart from each other and formed with inner slots Atthe opposite ends of the base are binding-posts 4, 5, 6, and 7, and at acentral point between the inner opposing sides of the subbases orsupports 2 a post 8 rises from the base 1 and has a switch disk 9rotatably mountedthereon and preferabl y constructed of wood, thoughother non-conducting material may be" employed, if desired.

The disk 9 has a series of contact-rings 10, 1 1, 1 '2, and 13 securedto the bottom thereof and arranged in concentricrelation withintervening spaces between their edges. The. central ring 13 iscontinuous with the boss 14 of a metal socket 15, extending through theopening 16 in the center of the disk 9 to bear on the post 8, the upperside of the disk at the center also having a metallic disk 17, seouredthereon. The upper end of the post 8 is screw-threaded and engaged byjam-nuts or securing-nuts 18, whereby the disk may be easily removed orapplied. The socket and the plate 17 prevent wear on the body of thedisk 9, and the boss 1 1 depends to such an extent as to sufficientlyelevate the under side of the disk 9 above the adjacent surface of thebase 1. The disk 9 is of such diameter that the periphery thereof willmove in close relation to the inner opposing slotted sides of thesubbases or supports 2, and on the periphery of said disk doublecontacts comprising elongated outwardly-projecting ribs 19 and 20 areremovably secured and double contacts 19 and 20 being diametricallydisposed. In planes at right angles to the double contacts 19 and 20 thedisk also has diametricallydisposed single contacts 21'and 22, alsoincluding upstanding ribs, and all the ribs are longitudinally curved orof areuate form. The outer edges of the ribs 19, 20, 21, and 22 areparallel with the periphery of the disk 9, and one pair of the ribs 19and 20 are conneeted by wires 23 and 24, respectively, to the rings 10and 12, as clearly shown by Fig. 6, and the opposite pair of contacts ofa similar nature are respectively attached by wires 25 and 2G with therings 11 and 13. The contact 21 is connected by a wire 27 with the ring10 and the opposite central contact by a wire 28 with the ring 12,strips 2.) of mica being interposed between the rings and the wiresconnecting the contacts with the rings at such points where it is notdesired that said wires shall have outward hearing or electricalengagement with other rings over which they extend.

()n the inner opposing slotted sides of the subbases or supports 2 pairsof side springs 30 are secured and have their free extremities inreverse arrangement and projected across the slots 3, the said springsbeing normally parallel in a vertical direction or so that the top edgeof one will be in parallel relation to the bottom edge of the other.These springs 30 are at such an elevation above the upper surface of themain base 1 that they may be engaged by either the double contacts 19and 20 or the lowermost ones of said springs by the single contacts 21and 22. As clearly shown by Fig. 3, the springs 30 are connected bywires 31 with the end binding-posts 4 and 7 of the series of said posts.In the upper portion of the main base, between the inner opposing sidesof the subbases or supports 2, a series of transverselyextending slots32 are formed, and disposed in operative engagement with said slots areopposite pairs of inwardly-extending basesprings 33 3i and 0o 06, thefree extremities of the said base-springs being located over saidsprings with the conductors on the bottom of the disk 9 the freeextremities of such springs are bowed upwardly, as clearly indicated byFi s. 4 and 5 and shown in detail by Fig. 7. The springs 33 34; areconnected by wires 37 with the binding-posts 5, and the springs 35 36are connected by wires 88 with the binding-post (i. The springs 35 36engage the outermost and innermost ring conductors 10 and 13 on thebottom of the disk 0, and the springs 3e are held in continual contactwith the conductors 11 and.12. The engagement of the springs 34 and 3536 with the conductors on the bottom of the disk 9 is positive and atall times maintained when the disk 9 is in operative position betweenthe subbases or supports 2. The telephone and extension hell areconnected up to the binding-posts 5 and G, and hence are in directconnection with the base-springs 33 34 and 35 36, and through the saidsprings will be connected with the circular conductors l0, 11, 12, and13 011 the bottom of the disk 9. From the circular conductors on thebottom of the disk 9 the connection for the telephone and extension-bellare continued through the wires 23, 24, 2', 26, 27, and 28 to theperipheral contacts on said disk, and said disk is made to rotate, thecontacts on the periphery thereof are brought into engagement with theside springs 30, and the circuit is made complete to line and ground inview of the fact that said springs are connected by the wires 31 throughthe posts 4- and 7 to line and ground.

To facilitate the operation or rotation ofthe disk 9, it is providedwith a knob or analogous projection 39, which is adapted to be graspedby the operator to move the disk, and said knob or projection will serveas a guide when the operation of the switch is fully understood toindicate when the particular connection desired has been obtained. orthe several peripheral contacts on the disk brought into engagement withthe side springs.

If the operator wishes to communicate with an office on the left-handline, he grasps the knob 39 and turns the disk 9 until the knob is atthe'left side or when the disk has moved a quarter-revolution, whichputsthe telephone in connection with that side and also automaticallyconnects the extension-bell with the right-hand line. If it is desiredto communieate with an ofliee on the right-hand line, the operator pullsthe knob to the right the same distance as in the former left operation.If the operator wishes to connect both lines in one, he pulls the diskin either direction until the knob 39 is up or down, and when the switchis so arranged the telephone will remain .in the circuit and theoperator can communicate in either direction, or the terminalsubscribers can communicate with each other through the switch andintermediate office.

Figs. 9 and 10 show a metallic-circuit attachment for the disk, the formof the disk heretofore explained being adapted for a ground-circuit.This metallic-circuit attachment comprises two strips 40, diametricallyarranged on the upper side of the disk and or otherwise secured tocontacts 43, similar in form to the contacts 19, 20,21, and 22 andlocated above the contacts 21 and 22. The contacts 43 are in the form ofmetal ribs and are disposed in parallel relation to the contacts 21 and22. This metallic-circuit attachment is shown as applied to the diskheretofore described, which is in all particulars similar to that shownby Figs. 9 and 10, and by this mode of illustration it is intended to beunderstood that the disk may be used with or without the said attachmentand the latter is of such form that the parts thereof maybe readilyapplied to and detached from the disk. The disks shown by Figs. 9 and 10are also numbered similarly to that shown by Figs. 1, 2, 4, and 6 andwill be supplied with the rings 10, 11, 12, and 13 for connecting up theribs or contacts 19, 20, 21, and 22. It willbe seen that themetallic-circuit attachment makes a complete connection across the diskbetween the two additional contacts 43, and the object in applying theattachment to the outer face or side of the disk isto obviate the dangerof forming any cross connections in thewiring on the back of the disk,and also renders it easy to remove'the attachment at any time desiredwhen the switch is in use on a ground-circuit.

Fig. 11 shows a diagrammatic view of what might be called amixed-circuit telephoneline. Ametallic circuit is formed from centralphone, shown on the left and to a groundcircuit phone on the right, theimproved switch being located at an intermediate point between the twophones. Now if the disk is turned to connect the phone with central sideof the switch the phone will be working on a metallic circuit, while theextension-bell will be connected with the residence-phone side ofswitch, which is a ground-circuit, or the case may be reversed. Shouldthe subscriber wish connection from residence to central,the disk willbe turned until the knob is down, for example, although it may be turnedeither way until the knobis up or down,

and touching the side spring XV, and out over line 2 to central. Thecircuit returns to switch on line 3, connecting with the side spring Win contact with the adjacent rib or contact 43 secured to one of thestrips 40 and across the disk to contact-point in connection with theother strip 40 which is in engagement with the side spring X, and fromlatter to ground, returning to ground and phone at the subscribersstation or residence. reverse'case in this instance may also be true,or, in other words, the current may flow in a reverse direction.

From the foregoing it will be seen that the improvedeXtension-bellswitch will be generally useful for the purpose for whichit has been devised, particularly in view of the metallic-circuitattachment. 1

Changes in the proportions, dimensions, and minor details may beresorted to without departing from the principle of the invention.

Having thus fully described the invention, what is claimed as new is 1.In a switch of the class set forth, the combination of a base havingyielding metallic conductors in the lower portion thereof and similarconductors at the sides in planes at right angles to those in thelower'portion, a rotary element held on the base between the sidesthereof having side contacts arranged in separated groups differing innumber, and metallic conducting devices on the face thereof adjacent tothe yielding. conductors in the lower portion of the base, saidmetallicconducting devices being independe'nly'connect ed to thecontacts, and electrical connections.

for the yielding metallic conductors.

2. A switch'of the class set forth comprise ing a base having sidemembers, lower yielding elements in the base and similar elementssecured to the inner opposing faces of the side members, electricalconnections for said elements, a rotary disk disposed on the base andprovided with separated conducting devices on the lower side thereof,and groups of contacts held on the periphery of the disk ICC andindividually opposed to said yielding eleelement whereby the switchmaybe converted for use with either a grounder a metallic circuit. g

4. A rotary extension-bell switch. comprising a base having lower andside contacting elements, a rotary disk provided with lower contactdevices, and groups of edge-contact devices disposed at diametricallyopposite points and differing in number in the respective groups, andelectrical connections for the elements and contact devices.

5. A rotary extension-bell switch, comprising a base having a series ofyielding springs disposed horizontally thereon, and another series ofside springs, electrical connections for the said springs, a rotary diskmounted on the base and having lower circular contact devices with Whichthe horizontal springs engage, and contacts arranged at intervals on theedge of the disk for engagement with the side springs, said contactsbeing individually connected with the contact devices on the lower sideof the disk.

(5. A rotary extension-bell switch, comprising a base having a pluralityof independent -conducting elements arranged in different positionsthereon, electrical connections for said elements, and arotary diskhaving conducting and contacting devices on the opposite faces and edge,the latter devices being individually connected to each other.

7. A rotary extension-bell switch, comprising a base having a series ofhorizontallydisposed springs rising therefrom, and end groups ofsprings, a rotary disk disposed on the base in close relation to thesprings and having a series of circular conducting devices, and contactprojections connected to the said conducting devices, and ametallic-circuit attachment consisting of strips renlovably applied tothe disk and also having contact projections in addition to thoseconnected to the conducting devices.

In testimony whereof I aflixv my signature in presence of two witnesses.

GEORGE E. CORK.

Witnesses:

EMMA K. 1IoLLo vELL, Gnoncn W. Penn.

